Why not?
I'm assuming he was saying that due to the lack of "external connections" on the device. I'm not sure how that really applies to audio, though, since most laptops do not have very good external connections for audio stuff anyway. Also, there are plenty of USB-C docks with loads of connections attached.
I had the pleasure of testing my UMC1820 on a PBP this weekend (beautiful and wonderful laptop!) and it worked just as good (if not better) than my old Lenovo Thinkpad. The latency isn't great (~11ms on lowest settings according to Ardour), but I never seem to get adequate latency settings via USB mixers - I prefer using the direct monitoring anyway.
If you're looking for low latency monitoring from your DAW, I'd recommend going with a PCIe sound card (and that probably means desktop). If you're using a USB interface with direct monitoring the PBP is more than adequate. It all comes down to your requirements & workflow.
EDIT: Also I find it funny those who are saying it doesn't have CPU power, I was running compiles crazy faster than my old x86 laptop. These modern arm chips are FAST for CPU-intensive work. Not as fast as an i7 but you are talking a laptop that can run a completely FOSS boot process that is being sold brand new in 2020 - that's the real stuff we need ATM.